Alarm clock



Feb. 14, 1939. A. B. REICHENBACH ALARM CLOCK 3 Sheets-Sheet l Filed Nov.2l, 1936 Feb. 14, 1939. A. B. REICHENBACH ALARM CLOCK Filed Nov. 2l,1936 3 Sheets-Sheet 2 Feb. 14, 1939. A. B. REICHENBCH ALARM CLOCK FiledNov. 2l, 1956 3 Sheets-Sheet 3 Patented Feb. 14, 1939 UNITED STATESPATENT OFFICE ALARM CLOCK Application November 21, 1936, Serial No.112,091

13 Claims.

This invention relates to an improvement in clocks, and particularly tothat class of audiblesignal clocks commonly referred to as alarm clocks.

One of the objects of the present invention is to provide a superioralarm clock in which the beat-frequency of the alarm-mechanism issufficiently slow as not to occasion undue shock to a sleeper.

A further object is to provide a superiorl alarm clock in which thebeat-frequency ci the alarmsounding means is determined by thetime-train.

Another object of the present invention is to provide a superiorspring-driven alarm clock embodying both a spring-driven time-train anda spring-driven alarm-train and in which the beatfrequency of thealarm-sounding means is modulated without recourse to complexgoverningmeans.

Still another object of the present invention is toprovide an alarmclock having superior means for providing a multiple-phase alarm-cycle,during one phase oi which the alarm is moderate and during thesubsequent phase of which the alarm is more violent.

A still further object is to provide a superior alarm clock in which thealarm-train, instead of being a burden upon the operation ofthetimetrain, will exert an effort to assist the said timetrain when thealarm-train is released.

With the above and otherolojects in View, as will appear to thoseskilled in the art from the present disclosure, this invention includesall features in the said disclosure which are novel over the prior artand which are not claimed by me in a separate application.

In the accompanying drawings:

Fig. 1 is a view in rear elevation of an alarm clock embodying thepresent invention with portions ci the rear movement-plate broken away;

Fig. 2 is an edge view thereof;

Fig. 3 is a View in rear elevation of the alarmtrain detached, togetherwith a portion of the time-train, the parts being shown in the positionswhich they assume when the alarm-governing pawl overrides thealarm-governing wheel;

Fig. 4 is a similar View but showing the frequency-changing memberacting te retire the frequency-governing pawl, to thus leave thealarmtrain free of outside restraint;

Fig. 5 is a detail sectional view taken on the line 5-5 of Fig. 4 andalso showing the front and rear movement-plates;

Fig. 6 is a perspective View of the frequencychanging member;

e ul

Fig. 7 is a perspective view of the unit comprising the verge-arbor,verge and alarm-stop arm;

Fig. 8 is a perspective view of the hammer or striker; and

Fig. 9 is a similar View of the frequency-governing pawl.

The particular alarm clock herein chosen for the illustration of thepresent invention includes a front movement-plate and a rearmovementplate 2| heldin rigid spaced relationship by interconnectingpillars 22. The movement-plates just referred to mount (mostly in thespace between them) both a time-train and an alarm-train havingcharacteristics which Will be more fully hereinafter described.

The time-train includes a mainor windingarbor 23 journaled in themovement-plates 2U and 2| and which, in the usual manner of the art,mounts a mainspring 24, the driving-urge of which latter is transmittedto a main-wheel 25 through the intermediary of a ratchet-wheel 26 and apawl 2T. The main-wheel 25 meshes into and drives a first-pinion 28 ofthe lantern type which is rigidly mounted upon and serves to drive thecenteror minute-arbor 29 of the time-train. The first-pinion 28 isrigidly attached to a second-wheel 39 which meshes into and drives asecond-pinion 3| mounted upon an arbor 32 journaled in themovement-plates 2D and 2|. The arbor 32 just referred to has rigidlyattached to it a third-wheel 33 which meshes into and drives athird-pinion 34 of the lantern type which, together with a fourth-wheel35, is rigidly mounted upon an arbor 36 journaled at its respectiveopposite ends in the movement-plates 2l) and 2| respectively.

The fourth-wheel of the time-train just referred to meshes into anddrives a fourth-pinion 3'! oi the lantern type which is rigidly attachedto an arbor 38 journaled in the movement-plates 26 and 2|. The arbor 38,in the manner usual in time-trains, has rigidly secured to it anescapewheel 39 which coacts with pallet-pins 40-40 in a pallet 4|mounted upon an arbor 42 intermediate the ends thereof. The arbor 42just referred to has rigidly secured to it an impulse-arm 43 cooperatingwith an impulse-pin 44 carried by a balance-wheel 45, which latter ismounted upon a usual balance-staff 46. The balance-stair 46 carries ausual hair-spring 47 having its inner end attached thereto and itsopposite end fastened to a bracket 48 forwardly projecting from the rearmovement-plate 2|.

The projecting forward end of the centeror minute-arbor 29 carries aminute-hand 49 and has loosely journaled upon it an hour-sleeve 50carrying an hour-hand l, as shown in Fig. 2. The hour-sleeve 59 isformed as a unit with an 5 hour-wheel 52 turning freely on thecenter-arbor 29 and which is driven by a dial-pinion v53 rotating upon astud 54 forwardly offsetting from the front movement-plate 28. Thedial-pinion 53 Ycarries a dial-wheel 55 which meshes into and is drivenby a minute-pinion 56 rigidly attached to the centeror minute-arbor 29immediately in front of the front movement-plate 2D.

Meshing into and driven by the dial-pinion 53 before described is analarm-control VWheel 51 rigidly carryinga sleeve-like alarm-control cam58 and journaled upon the projecting forward end of an alarm-set staff59 which latter is in turn journaled in both of the movement-plates 28and 2l. In the usual manner of alarm clocks, the sleeve-likealarm-control cam 58 is provided in its forward edge with a notch 60which is adapted to receive an alarm-control finger 6I rigidly attachedto and radially offsetting from the extreme forward portion of thealarm-set staff 59.

alarm-control wheel 51, together with the cam 58, is urged forwardly bya sheet-metal alarm-control spring 62 which is secured at its outer endto the forward face of the front movement-plate 28 by means of a stud63. At its inner or free end the alarm-control spring 62 is bent to forman alarm-control finger 64 which, under the control of the cam 58 andthe alarm-control finger 6|, moves into" and out of the path ofoscillation of an alarm-stop arm 65.

The alarm-stop arm 65 just above referred to forms a feature of thealarm mechanism and is rigidly attached at one end to a verge-arbor 66journaled in the front and rear movement-plates 28 and 2l. The saidverge-arbor 66 has rigidly attached to it a verge 61 which is vibratedin a manner usual in alarm mechanisms, by a toothed verge-wheel 68 whichis staked upon an arbor 69 journaled in the front and rearmovement-plates 20 and 2l. In addition to the verge-wheel 68, the arbor69 has staked to it a lantern-pinion 10 which meshes into and is drivenby an alarm main-wheel 1| mounted uponthe main-arbor 12 of thealarm-train. The said arbor 12 is driven by a spiral alarm-mainspringY13 through the usual intermediary of a ratchet-wheel 14 and a pawl 15.

The verge 61 is provided with an offsetting hammer-actuating arm 16tothe lower end of .v which is pivoted the adjacent end of a link 11having its opposite end pivotally connected to a hammer or striker 18.The said hammer is rigidly mounted intermediate the movement-plates 20and 2l upon a hammer-staff 19 which is journaled in the saidmovement-plates. The hammer 18 is preferably formed of sheet-metal andis provided with an enlarged terminal constituting a hammer-head 88which is adapted tofstrike a bell or other sounder 8l indicated bybroken lines in Fig. 1.

Pivotally mounted upon the link 11 by means of a stud 82 is afrequency-governing pawl 83, preferably formed of sheet-metal and havinga nose 84 which is adapted to engage the ratchetlike teeth of afrequency-governing wheel 85 staked upon the arbor 36 which carries thefourthwheel 35 of the time-train. The pawl 83 is provided adjacent therespective opposite sideedges of the link 11 with twoforwardly-projecting fingers 86 and 81, the former of which is Also inthe usual manner of alarm clocks, the

adapted to limit the upward swinging movement of the pawl, and thelatter of which is designed to be engaged by a member which will preventthe nose 84 of the said pawl from engaging with the wheel 85 in a manneras will hereinafter appear. 'I'he pawl 83 also has a perforated finger88 bent rearwardly from it, through which extends the free end of awire-like spring 89 swaged into the slotted rear end of the stud 82 uponwhich the said pawl 33 swings.

For the purpose, on occasion, of preventing the nose 89 of the pawl 83from engaging with the frequency-governing wheel 85 so as to permit thehammer or striker 18 to vibrate freely in a manner as will hereinafterappear, an L-shaped frequency-changing member, generally designated bythe numeral 98, is employed. The said frequency-changing member 90includes a camlike nose 9! offsetting from the outer end of a radial arm92 which is mounted for swinging movement upon a collet 93 rigidlyfastened upon the main-arbor 12 of the alarm-train. The said member 90is frictionally coupled to the collet 93 by being urged against theflange-terminal Vthereof by a helical spring 94 encircling the saidcollet. The degree of friction betweenthe member 96 and the collet 93 issuiiicient to cause the nose 9i of the said member to swing in aclockwise direction, as viewed in Figs. 1, 3 and 4, and suspend theaction of the pawl 83 without, however, preventing the turning of themain-arbor 12.

To limit the clockwise turning movement of the frequency-changing member9D, the said member is bent up to provide a rearwardly-projectingstop-finger 95 which engages on occasion with a stop-finger 96 forwardlyprojecting from the rear movement-plate 2 l. VThe counterclockwiseturning movement of the frequency-changing member 90, which occursduring the winding of the alarm-spring 13, is limited by the engagementof the said member with the arbor 69 of the vergewheel 68.

The parts 63,- 85 and 98, or their equivalents,

may be viewed jointly as constituting beat-frequency-governing means,since the said parts in effect cause on one hand the retardation of thevibrations of the striker 18 under the driving urge of the verge-wheel68, and then release the said striker for free vibration by the saidverge-wheel, all in theV manner as will hereinafter appear.

For the purpose of describing the operation of the alarm-clock movementherein illustrated, let it be presumed that the mainspring 24 of thetime-train is wound and that the said train is running, and further thatthe mainspring 13 of the alarm-train 'has been wound by turning themain-arbor 12 in a counterclo'ckwise direction, as viewed in Figs. 1, 3and 4, to thus bring the frequency-changing member 90 into a retiredposition, as shown in Figs. l and 3. In this connection, it is to beexplained that the turning of the main-arbor 12 in a counterclockwisedirection to wind the alarm-mainspring 13, as described, is permitted byreason of the fact that the frequency-changing member 96 is frictionallyattached to the said arbor, and when in a winding operation it strikesthe verge-wheel arbor 69, the said main-arbor may be further rotated tocomplete the winding of the said spring 13.

When in the usual course of the operation of the clock, the notch 68 inthe alarm-control cam 58 comes into registration with the alarm-controlfinger 6l on the alarm-set staif 59, the sheetmetal spring 62 will flexforwardly and axially slide the said cam, together with the wheel 51, in

the same direction. The forward flexing of the spring S2 will effect theretirement of its alarmcontrol finger 64 out of the path of thealarmstop arm 65, whereupon'the alarm-mainspring 13, acting through theverge-wheel 68 and verge El, will be free to urge the link 'l1 and hencethe pawl 83 and hammer or striker 18 to the left from the positions inwhich they are shown in Fig. 1. This advance from right to left will,however, be retarded by the engagement of the nose 84 of the said pawlwith the frequency-governing wheel 85 which is being turned butrelatively slowly by the time-train, in the direction indicated. Thus,theurge of the alarm-mainspring to vibrate the hammer or striker 18 willbe retarded and the energy of the said spring Will be applied inassisting in the turning of the said wheel 85, and hence assisting themainspring to operate the entire time-train.

As the particular tooth of the wheel 85 with which the pawl-nose B4 isengaged reaches substantially its topmost'position, the said pawl-nosewill be forced out of engagement with the said tooth by thenext-succeeding tooth and will slide over the periphery of the saidwheel to the limit of its movement to the left, thus permitting itsassociated parts to assume the positions shown in Fig. 3. rlhe verge 61will now immediately move the parts back to substantially the positionsin which they are shown in Fig. 1 and thus cause the hammer-head tostrike the bell or sounder 8|.

The cycle above described will now be repeated at relatively-longintervals (five seconds, for instance), depending upon the peripheralspeed of the frequency-governing wheel 85. After a predetermined numberof cycles, as described, the alarm-mainspring 13, in its unwinding, willturn the main-arbor 12 and the frequency-changing member 9G in aclockwise direction until the camlike nose 9! of the said member ridesunder the iinger 8'! of the pawl 83 to a degree sufficient to preventthe nose 84 of the same from engaging with the teeth of the wheel 85. Assoon as the pawl $3 is in effect rendered inoperative by the member 9d,as described, the verge 61 and vergewheel 558 will cause the rapidvibration of the hammer or striker 78, which under the conditions iustdescribed is free of any restraint by the time-train and may, therefore,vibrate at five beats per second, for instance.

When the nger 95 of the frequency-changing member 9G engages with thestop-finger 96 of the movement-plate 2l, the clockwise turning movementof the said member will be checked, but the main-arbor 'l2 will continueto turn to actuate the hammer or striker 18, owing to therelativelyslight frictional coupling of the member S0 with the saidarbor 12.

From the foregoing, it will be seen that the movement of the hammer orstriker 18 or its equivalent may be so governed and reduced in frequencyby the time-train acting through the wheel as to produce abeat-frequency which will not unduly shock even the lightest ofsleepers.

In the event that asleeper is not sufiiciently aroused by therelatively-slow beat-frequency of the alarm when the same is under thecontrol of the pawl 83 and the wheel 85, the frequencychanging member orits equivalent may be employed to free the alarm-mechanism of restraintby the time-train and thus permit the same to accelerate itsbeat-frequency.

The invention may be carried out in other specific ways than thoseherein set forth without departing from the spirit and essentialcharacteristics of the invention, and the present embodiments are,therefore, to be considered in all espects as illustrative and notrestrictive, and all changes coming Within the meaning and equivalencyrange of the appended claims are intended to be embraced therein.

I claim:

1. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating striker operatively connected tothe said alarm-train for being vibrated thereby; and beat-frequencydiminishing-means for forcibly diminishing the natural unrestrainedbeatfrequency of the said striker to a beat-frequency materially slowerthan the natural unrestrained beat-frequency thereof, and including twocoacting members, one of which is operatively connected to the saidalarm-train for being vibrated thereby concurrently with the saidstriker, and the other of which members is operatively connected to thesaid time-train by which it is driven, the two said coacting membersbeing so constructed and arranged that the said vibrating member drivenby the alarm-train assists in propelling the other of said coactingmembers.

2. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating strike' operatively connected tothe said alarm-train for being vibrated thereby; beat-frequencydiminishing means for forcibly diminishing the natural unrestrainedbeatfrequency of the said striker to a beat-frequency materiallyslot-ver than the natural unrestrained beat-frequency thereof, andincluding two coacting members, one of which is operatively connected tothe said alarm-train for being vibrated thereby concurrently with thesaid striker, and the other of which members is operatively connected tothe said time-train by which it is driven, the two said coacting membersbeing so constructed and arranged that the said vibrating member drivenby the alarm-train assists in propelling the other of said coactingmembers; and automatic means operatively-controlled by one of the saidtrains and being operable thereby during the driving-operation of thealarm-train at a predetermined time in the said driving-operation toautomatically shift one of the two said coacting members of thebeat-frequency diminishing-means out of coacting relationship with theother of said members to render the said means inoperative and permitthe unrestrained continuous vibration of the said striker by the saidalarm-train.

E. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating striker operatively connected tothe said alarm-train for being vibrated thereby; beat-frequencydiminishing means for forcibly diminishing the natural. unrestrainedbeatfrequency of the said striker to a beat-frequency materially slowerthan the natural unrestrained beat-frequency thereof, and including twocoacting members, one of which is operatively connected to the saidalarm-train for being vibrated thereby concurrently with the saidstriker, and the other of which members is operatively connected to thesaid time-train by which it is driven, the two said coacting membersbeing so constructed and arranged that the said vibrating member drivenby the alarm-train assists in propelling the other of said coactingmembers; and a releasing member frictionally coupled to and frictionallydriven'by the said alarm-train and engageable with the said vibratingmember of the said beat-frequency diminishing-means to move the same outof coacting relationship with the other of said members to render thesaid meansV inoperative and permit the unrestrained continuous vibrationof the said striker by the said alarmtrain.

4. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating striker operatively connected tothe said alarm-train for being vibrated thereby; and beat-frequencydiminishing-means for forcibly diminishing the natural unrestrainedvbeatfrequency of the said striker to a beat-frequency materially slowerthan the natural unrestrained beat-frequency thereof, and includingr avibratable pawl operatively connected to the said alarm-train for beingvibrated thereby concurrently with the said striker, and a toothed wheelcoacting with the said pawl and operatively connected to the saidtime-train by which it is driven, the said vibratable pavvl and the saidtoothed wheel being constructed and arranged so that the said pavvlautomatically slides oi the said toothed wheel as the latter is turnedby the timetrain to permit the said striker to move for sounding asingle-beat alarm.

5. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating striker operatively connected tothe said alarm train for being vibrated thereby; beat-frequencydiminishing-means for forcibly diminishing the natural unrestrainedbeat-irequency of the said striker to a beat-frequency materially slowerthan the natural unrestrained beat-frequency thereof, and including aVibratable pawl operatively connected to the said alarmtrain for beingvibrated thereby concurrently with the said striker, and a toothedwheelcoacting with the said pavvl and operatively connected to the saidtime-train by which it is driven. the said vibratable pawl and the saidtoothed wheel being constructed and arranged so that the rsaid pawlautomatically slides oi the said toothed wheel as the latter is turnedby the time-train to permit the said striker to move for sounding asinglebeat alarm; and automatic means operativelycontrolled by the saidalarm-train and being operable thereby during the driving-operation ofthe alarm-train at a predetermined time in the said driving-operation toautomatically shift the said vibratable pawl out of coactingrelationship with the said toothed wheel to render the saidbeat-frequencyV diminishing-means inoperative and permit theunrestrained continuous vibration of the said striker by the saidalarm-train.

6. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating striker operatively connected tothe said alarm-train for being vibrated thereby; beat-frequencydiminishing-means for Yforcibly diminishing the natural unrestrainedbeat-irequency of the said striker to a beat-frequency materially slowerthan the natural unrestrained beat-irequency thereof, and including avibratable pawl operatively connected to the said alarm-train for beingvibrated thereby concurrently with the said striker, and a toothed wheelcoacting with the said pawl and operatively connected to the saidtime-train by which it is driven', the said vibratable pawl and the saidtoothed wheel being constructed and arranged so that the said pawlautomatically slides ofi the said toothed Wheel as the latter turns topermit the tively connecting the said striker to the said Y alarm-trainfor being vibrated thereby; a Vibrating pawl pivotally carried by thesaid link; and a toothed wheel coacting with the said vibrating pawl anddriven by the said time-train, the said vibrating pawl and the saidtoothed wheel being constructed and arranged so that said pawlautomatically slides 01T the said toothed wheel as the latter turns topermit the said striker to move for sounding a brief alarm.

8. An alarm clock including in combination: a power-driven time-train; apower-driven alarmtrain; a vibrating striker; a vibrating linkoperatively connecting the said striker to the said alarm-train forbeing vibrated thereby; a vibrating pawl pivotally carried by the saidlink; a toothed wheel coacting with the said vibrating pawl and drivenby the said time-train, the said vibrating pawl and the said toothedwheel being constructed and arranged so that said pawl automaticallyslides oi the said toothed wheel as the latter turns to permit the said`striker to move for sounding a brief alarm; and a pavvl-releasing memberdriven by and frictionally coupled to the said-alarm-train and engagingwith the said vibrating pawl to retire the same out of coactingrelationship with the said toothed wheel to permit the unrestrainedcontinuous vibration of the said striker by the said alarm-train.

9. An alarm clock including in combination: a power-driven time-train;alpower-driven alarmtrain; a vibrating striker operatively connected tothe said alarm-train for being vibrated thereby; beat-frequencydiminishing-means for forcibly diminishing the natural unrestrainedbeat-irequency of the said striker to a beat-frequency inateriallyslower than the natural unrestrained beat-frequency thereof, andincluding two coacting members, Vone of which is operatively'connectedto the said alarm-train for being vibrated thereby concurrently with thesaid striker, and the other of which members is operatively connected tothe said time-train by which it is driven, the two said coacting membersbeing arranged in normally disengaged relation; a iirst one of the saidmembers being operable by one of the said trains during thedriving-operation of the alarm-v train and at a predetermined time inthe said driving-operation to be shiitediinto coacting engaging relationto the other of the said members, whereby vibration of the striker isrestrained; and automatic means operatively-controlled by said one ofthe trains and operable thereby at another and later predetermined timein the said drivingoperation of the-said alarm-train to automaticallyshift the saidrst one'of the two said coacting members of thebeat-frequency diminishingmeans out of coacting relationship with theother of said members to render the said means inoperative and permitthe unrestrained continuous vibration of the said striker by the saidalarmtrain.

l0. An alarm clock including in combination: a power-drivenV ntime-train; a power-driven alarm-train; a vibrating striker operativelyconnected to the said alarm-train for being vibrated thereby;beat-frequency diminishing-means for forcibly diminishing the naturalunrestrained beat-frequency of the said striker to a beatfrequencymaterially slower than the natural unrestrained beat-frequency thereof,and including two coacting members, one of which is operativelyconnected to the said alarm-train for being vibrated therebyconcurrently with the said striker, and the other of which members isoperatively connected to the said time-train by which it is driven, thetwo said coacting members being arranged in normally disengagedrelation; the vibration member connected to the alarm-train beingoperable thereby during the driving-operation of the larm-train and at apredetermined time in the said driving-operation, to be shifted intocoacting engaging relation to the other of the said members, wherebyvibration of the striker is restrained; and automatic meansoperatively-controlled by the said alarm-train and operable thereby atanother and later predetermined time in the said driving-operation ofthe said alarm-train to automatically shift the said Vibrating member ofthe beat-frequency diminishing-means out of coacting relationship withthe other of said members to render the said means inoperative andpermit the unrestrained continuous vibration of the said striker by thesaid alarm-train.

11. An alarm clock including in combination: a power-driven time-train;a power-driven alarl train; a Vibrating striker; a Vibrating linkoperatively connecting the said striker to the said alarm-train forbeing vibrated thereby, and cacting members including a Vibrating pawlpivotally carried by the said link, and a toothed Wheel coacting withthe said vibrating pawl and driven by the said time-train; the saidvibrating pawl and toothed wheel being arranged in normally disengagedrelation, and one of the said coacting members being operable by itscontrolling train connected therewith during the driving-operation ofthe alarm-train and at a predetermined time in the saiddriving-operation, to be shifted into engagement with the other of thesaid coacting members and effect coacting relationship between the saidvibrating pawl and toothed wheel and the said Vibrating pawl and thesaid toothed wheel being constructed and arranged so that said pawlautomatically slides off the said toothed wheel as the latter turns topermit the said striker to move for sounding a brief alarm.

12. An alarm clock including in combination: a power-driven time-train;a power-driven alarm-train; a vibrating striker; a vibrating linkoperatively connecting the said striker to the said alarm-train forbeing vibrated thereby, coacting members including a vibrating pawlpivotally carried by the said link, and a toothed wheel coacting withthe said vibrating pawl and driven by the said time-train; the saidvibrating pawl and toothed wheel being arranged in normally disengagedrelation, and one 0i" the said enacting members being operable by itscontrolling train connected therewith during the driving-operation ofthe alarm-train and at a predetermined time i in the saiddriving-operation, to be shifted into engagement with the other of thesaid coacting members and eiect coacting relationship between the saidVibrating pawl and toothed wheel and the said vibrating pawl and thesaid toothed wheel being constructed and arranged so that said pawlautomatically slides off the said toothed wheel as the latter turns topermit the said striker to move for sounding a brief alarm; andautomatic means operable by the said controlling train at another andlater predetermined time in the said driving-operation of the saidalarmtrain to automatically shift the said one of the two coactingmembers out of coacting relationship with the other of the said membersto permit unrestrained continuous vibration of the vibrating striker bythe said alarm-train.

13. An alarm clock including in combination: a power-driven time-train;a power-driven alarm-train; a vibrating striker; a vibrating linkoperatively connecting the said striker to the said alarm-train forbeing vibrated thereby; a vibrating pawl pivotally carried by the saidlink; a toothed wheel coacting with the said vibrating pawl and drivenby the said time-train; the said vibrating pawl and toothed wheel beingarranged in normally disengaged relation, and the said vibrating pawlbeing operable by the alarm-train during the driving-operation of thealarm-train and at a predetermined time in the said drivingoperation, tobe shifted into coacting engaging relation to the said toothed wheel;the said Vibrating pawl and the said toothed wheel being constructed andarranged so that said pawl automatically slides off the said toothedwheel as the latter turns to permit the said striker to move forsounding a brief alarm; and a pawl-releasing member driven by andirictionally coupled to the said alarm-train and engaging at another andlater predetermined time in the said drivingoperation of the saidalarm-train with the said vibrating pawl to retire the same out ofcoacting relationship with the said toothed Wheel to permit theunrestrained continuous vibration of the said striker by the saidalarm-train.

ALBERT B. REICHENBACH.

Lil

